Tunisian police have fired tear gas to disperse protesters who had gathered outside the U.S. Embassy in the Tunisian capital, Tunis, to protest a film deemed offensive to Islam.

The film, privately produced in the United States, has already triggered a deadly attack on a U.S. Consulate in Libya and an angry protest at the U.S. Embassy in Egypt on September 11.

Some 200 protesters reportedly burned U.S. flags and threw rocks at police outside the U.S. Embassy in Tunis.

Protesters were kept back from the embassy by reinforced security.

Meanwhile, Tunisian President Moncef Marzouki denounced the killing of U.S. Ambassador Chris Stevens and three of his American co-workers in the attack in the eastern Libyan city of Benghazi as a "terrorist act."